First off, apologies to any one else above who may well have given the answer(s) you need, but have just grabbed my summer 1963 CWN (I believe the ACE was withdrawn as a through named train at the end of summer 64? - the CWN for that period I don't have).
Also, I do not possess the relevant Appendix to the CWN to give details of actual carriage types within the various 'Set' formations, so this can only be a guide;
The ACE itself (11 a.m. Waterloo) shown formed thus from Waterloo;
FX, until 25/7 and from 26/8, also FO
Ilfracombe 3 Set L, (in my time, 1970's BR Mk 1's, these were formed BSK/CK/BSK if my memory is correct, but this varied over the years).
Padstow 5 Set,
Exeter Ctl 1 RKB, 1 RCO,
Exmouth 1 BCK,
Sidmouth 1 BCK
FX, 29/7 to 22/8
Ilfracombe 2 Set R, 3 Set L,
Exeter Ctl 1 RKB, 1 RCO,
Exmouth 3 Set L,
Sidmouth 2 BCK
Then the 11.05 Relief, FX, 29/7 to 22/8 as follows from Waterloo;
Padstow 5 Set
Exeter Ctl 1 RB, 1 RUO, 2 Set R, 3 Set L (MO), 2 Set R (ThO).
Basically a bit of a minefield taking all various dates and formation variations in to account!